Elements of Remote Sensing MCQs

Question 1

Which one of the following statements is correct to remote sensing?

Accepted Answer

All of these.

Answer

The basic property used to identify objects, is called signature.

Answer

The ratio of the reflected flux to incident flux is called reflectance which varies fron 0 to 1.

Answer

The surface from which emergent radiance is constant in all directions is called Lambertian surface.

Question 2

Which one of the following statements is correct?

Accepted Answer

All of these

Answer

at radians equal to 1800.

Answer

The cone subtended by an area on the sphere at the centre, is called the solid angle.

Answer

The solid angle is equal to the ratio of the area on the sphere and the square of the radius of the sphere.

Question 3

Which one of the following quantities forms the basis of radiometery?

Accepted Answer

All of these

Answer

Radiant energy (Q)

Answer

Radiant flux ((1))

Answer

Radiant intensity (I)

Question 4

The reflectance from a surface is called specular reflection if it follows:

Accepted Answer

Snells's law

Answer

Lambert's cosine law

Answer

Planktan's law

Answer

All of these

Question 5

Rayleigh's criteria for a rough surface is, where letters carry their usual meanings.:

Accepted Answer

h > X/8 cos 0

Answer

h > XIA cos 0

Answer

h = 2J8 cos 0

Answer

h < A./8 cos 0

Question 6

Identification of crops is affected by:

Accepted Answer

All of these

Answer

the spectral characteristics of the sensor

Answer

the spatial characteristics of the sensor

Answer

the radio metric characteristics of the sensor

Question 7

Remote sensing techniques makes use of the properties of emitfed, reflected or diffracted by the sensed objects:

Accepted Answer

electromagnetic waves

Answer

electric waves

Answer

sound waves

Answer

wind waves

Question 8

Remote sensing techniques are being usefully employed for the purpose of:

Accepted Answer

All of these

Answer

improving natural resource management

Answer

land use

Answer

protection of the environment

Question 9

The entire range of the electromagnetic spectrum spans a large spectrum of wave lengths varying from:

Accepted Answer

10 - 10 to 106m

Answer

10-8 to 106m

Answer

10 -10 to 1010m

Answer

10 -8 to 108m